"Bronx Borough President Ruben Diaz says changes must be made, including higher railings along the highway, but also says drivers need to be careful.

" 'We call on all of the motorists to slow down. Perhaps we have to do better on signage perhaps. Perhaps we have do better visibility with law enforcement. Perhaps we have to warn people or have certain graphics or paintings on the ground,' Diaz said."

The Associated Press writes that Sunday's tragedy occurred when an "out-of-control SUV barreled across several lanes of traffic on a highway overpass ... then plunged more than 50 feet off the side of the road and landed in a ravine on the grounds of the Bronx Zoo." The victims included three children.

"In the 2006 case," the Daily News says, "six members of one family, including a 6-year-old girl, were killed when their Acura Legend went out of control, went over the concrete median and into oncoming traffic."

Each accident happened between exits 5 and 6 of the parkway. A possible contributing factor, according to the Daily News: traffic tends to suddenly slow there, surprising approaching drivers.

According to The New York Times, New York State Department of Transportation spokesman Adam Levin said the agency is "going to do our investigation into this accident and see if anything needs to be done to improve the safety of the area."